clover vs herb

clover and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
clover	Yes	No	No	No
herb	Yes	No	No	No

As nouns, herb is a hypernym of clover; that is, herb is a word with a broader meaning than clover:

clover: a plant of the genus Trifolium
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of clover include herbaceous plant.

clover (noun)	herb (noun)
a plant of the genus Trifolium	aromatic potherb used in cookery for its savory qualities
	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests